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USB VBUS regulator was attached to GPIO19, which isn't in fact controlling the modem power itself, but rather modem power key - which has to be asserted high for at least 500ms, to start the modem. Keeping it high allows the modem to reboot upon shutdown - so it is desirable to control this line from userspace, for example - to allow clean modem shutdown down upon powering off the router part. Signed-off-by: Lech Perczak <lech.perczak@gmail.com> Link: https://github.com/openwrt/openwrt/pull/17503 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>